Hi Ashley, do you mean you would like to 'dress up' your day-time work outfits to go out in the evening, or would you like some suggestions on how to accessorize more during the day?
Anyway, in both cases, I agree with Merry and LegacyofPearl.
You could also try pairing the trousers with a nice jacket with some fun details or a waistcoat and/or a ruffled blouse etc.
And how about a pin (Angie recently blogged about this), colourful bangles, longer earrings if you wear them...